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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Nix Award and Lecture Symposium: Mechanistic Understanding of Mechanical Behavior Across Length Scales
Presentation Title Nix Award Lecture: Damage Tolerance in Materials
Author(s) Robert O. Ritchie
On-Site Speaker (Planned) Robert O. Ritchie
Abstract Scope A material’s capacity for limited deformation is a critical aspect of toughness as this enables the local dissipation of stresses that would otherwise cause fracture. Such inelastic deformation mechanisms are diverse; they include dislocation motion in crystalline materials, in-situ phase-transformations in certain metals and ceramics, sliding of collagen fibrils in bone, rotation of fibrils in skin, frictional motion between mineral “platelets” in seashells, and through mechanisms that also cause fracture such as shear-banding in glasses and microcracking in rocks. Resistance to fracture is thus a compromise: either a combination of the mutually exclusive properties of strength and deformability, as in intrinsic toughness, or between intrinsic and extrinsic (shielding) mechanisms that act to induce toughness, respectively, ahead or behind, the tip. We examine the interplay between such mechanisms in biological materials, including skin and bone, high-temperature materials, such as ceramic-matrix composites and nuclear graphite, and in bulk-metallic glasses and high-entropy alloys.
Proceedings Inclusion? Undecided


Amorphization: A New Dislocationless Deformation Mechanism?
Early Nanoscale Dislocation Processes and Two Creep Rate Minima in SX Ni-base Superalloys
Hybrid Nanocomposites at the Extreme Limits of Molecular-scale Confinement
Measurement of Mechanical Properties by Nanoindentation: Recent Innovations in Testing Methodology
Mechanical Properties of High Entropy Alloys
Nix Award Lecture: Damage Tolerance in Materials
The Dynamics of Precipitate Shearing in fcc/L12 Alloys
The Role of Solutes and Short Range Order (SRO) in the Deformation of α-Ti Alloys
Toughening and Energy Dissipation in Metamaterials

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